Method of manufacturing a multi-nozzle ink jet head

Abstract

A manufacturing method for a multi-nozzle ink jet head using piezoelectric elements. The head has a nozzle member in which a plurality of nozzles are formed, a pressure chamber wall member in which a plurality of pressure chambers are formed, and piezoelectric type actuators that have a diaphragm and a plurality of piezo elements and apply pressure to each of the plurality of pressure chambers for ejecting ink from the nozzles. A coating member having high rigidity is provided on inner surfaces of the pressure chamber walls or on parts of the diaphragm in contact with the pressure chamber wall member, thus increasing the rigidity of the pressure chamber walls.

1. A method of manufacturing a multi-nozzle ink jet head having a plurality of nozzles and a plurality of pressure chambers, comprising the steps of:
 producing piezoelectric type actuators having a diaphragm and a plurality of piezo elements; 
 forming, on the piezoelectric type actuators on a side of the diaphragm opposite to the piezo elements, first pressure chamber wall base parts constituting a portion of the piezoelectric type actuator side of dividing walls of the plurality of pressure chambers; 
 superimposing, on a side of the first pressure chamber wall base parts opposite from the piezoelectric type actuators, second pressure chamber wall base parts constituting a portion of the dividing walls in such a manner that the first pressure chamber and the second pressure chamber wall base parts constitute the dividing walls; and 
 forming a nozzle member in which the plurality of nozzles correspond to the plurality of pressure chambers divided by the dividing walls having the first pressure chamber wall base parts and the second pressure chamber wall base parts, 
 wherein the first pressure chamber wall base parts each include a high rigidity member having a higher rigidity than the second pressure chamber wall base parts. 
 
     
     
       2. The method of manufacturing a multi-nozzle ink jet lead as defined in  claim 1 , wherein the high rigidity member has a taper shape such that the high rigidity member gets wider gradually toward the diaphragm. 
     
     
       3. The method of manufacturing a multi-nozzle ink jet lead as defined in  claim 1 , wherein the high rigidity member is formed on a core material of each of the dividing walls of the plurality of pressure chambers.